import java.io.IOException;
import javax.management.Attribute;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;
import javax.management.remote.JMXConnectorServer;
import javax.management.remote.JMXConnectorServerFactory;
import javax.management.remote.JMXServiceURL;

public class Server {

    public static void main(String[] args) {
        try {
            // Instantiate the MBean server
            //
            echo("\n>>> Create the MBean server");
            MBeanServer mbs = MBeanServerFactory.createMBeanServer();
	    waitForEnterPressed();

	    // Get default domain
	    //
            echo("\n>>> Get the MBean server's default domain");
	    String domain = mbs.getDefaultDomain();
	    echo("\tDefault Domain = " + domain);
	    waitForEnterPressed();

	    // Create and register the SimpleStandard MBean
	    //
	    String mbeanClassName = "SimpleStandard";
	    String mbeanObjectNameStr =
		domain + ":type=" + mbeanClassName + ",name=1";
	    ObjectName mbeanObjectName =
		createSimpleMBean(mbs, mbeanClassName, mbeanObjectNameStr);
	    waitForEnterPressed();

	    // Get and display the management information exposed by the
	    // SimpleStandard MBean
	    //
	    printMBeanInfo(mbs, mbeanObjectName, mbeanClassName);
	    waitForEnterPressed();

	    // Manage the SimpleStandard MBean
	    // 
	    manageSimpleMBean(mbs, mbeanObjectName, mbeanClassName);
	    waitForEnterPressed();

	    // Create and register the SimpleDynamic MBean
	    //
	    mbeanClassName = "SimpleDynamic";
	    mbeanObjectNameStr =
		domain + ":type=" + mbeanClassName + ",name=1";
	    mbeanObjectName =
		createSimpleMBean(mbs, mbeanClassName, mbeanObjectNameStr);
	    waitForEnterPressed();

	    // Get and display the management information exposed by the
	    // SimpleDynamic MBean
	    //
	    printMBeanInfo(mbs, mbeanObjectName, mbeanClassName);
	    waitForEnterPressed();

	    // Manage the SimpleDynamic MBean
	    // 
	    manageSimpleMBean(mbs, mbeanObjectName, mbeanClassName);
	    waitForEnterPressed();

            // Create an RMI connector server
            //
            echo("\nCreate an RMI connector server");
            JMXServiceURL url = new JMXServiceURL(
		      "service:jmx:rmi:///jndi/rmi://localhost:9999/server");
            JMXConnectorServer cs =
                JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs);

            // Start the RMI connector server
            //
            echo("\nStart the RMI connector server");
            cs.start();
            echo("\nThe RMI connector server successfully started");
	    echo("and is ready to handle incoming connections");
            echo("\nStart the client on a different window and");
	    echo("press <Enter> once the client has finished");
	    waitForEnterPressed();

	    // Stop the RMI connector server
	    //
            echo("\nStop the RMI connector server");
	    cs.stop();
            System.out.println("\nBye! Bye!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    

    private static ObjectName createSimpleMBean(MBeanServer mbs,
						String mbeanClassName,
						String mbeanObjectNameStr) {
	echo("\n>>> Create the " + mbeanClassName +
	     " MBean within the MBeanServer");
	echo("\tObjectName = " + mbeanObjectNameStr);
	try {
	    ObjectName mbeanObjectName =
		ObjectName.getInstance(mbeanObjectNameStr);
	    mbs.createMBean(mbeanClassName, mbeanObjectName);
	    return mbeanObjectName;
	} catch (Exception e) {
	    echo("\t!!! Could not create the " + mbeanClassName + " MBean !!!");
	    e.printStackTrace();
	    echo("\nEXITING...\n");
	    System.exit(1);
	}
	return null;
    }

    private static void printMBeanInfo(MBeanServer mbs,
				       ObjectName mbeanObjectName,
				       String mbeanClassName) {
	echo("\n>>> Retrieve the management information for the " +
	     mbeanClassName);
	echo("    MBean using the getMBeanInfo() method of the MBeanServer");
	MBeanInfo info = null;
	try {
	    info = mbs.getMBeanInfo(mbeanObjectName);
	} catch (Exception e) {
	    echo("\t!!! Could not get MBeanInfo object for " +
		 mbeanClassName +" !!!");
	    e.printStackTrace();
	    return;
	}
	echo("\nCLASSNAME: \t" + info.getClassName());
	echo("\nDESCRIPTION: \t" + info.getDescription());
	echo("\nATTRIBUTES");
	MBeanAttributeInfo[] attrInfo = info.getAttributes();
	if (attrInfo.length > 0) {
	    for (int i = 0; i < attrInfo.length; i++) {
		echo(" ** NAME: \t" + attrInfo[i].getName());
		echo("    DESCR: \t" + attrInfo[i].getDescription());
		echo("    TYPE: \t" + attrInfo[i].getType() +
		     "\tREAD: "+ attrInfo[i].isReadable() +
		     "\tWRITE: "+ attrInfo[i].isWritable());
	    }
	} else echo(" ** No attributes **");
	echo("\nCONSTRUCTORS");
	MBeanConstructorInfo[] constrInfo = info.getConstructors();
	for (int i=0; i<constrInfo.length; i++) {
	    echo(" ** NAME: \t" + constrInfo[i].getName());
	    echo("    DESCR: \t" + constrInfo[i].getDescription());
	    echo("    PARAM: \t" + constrInfo[i].getSignature().length +
		 " parameter(s)");
	}
	echo("\nOPERATIONS");
	MBeanOperationInfo[] opInfo = info.getOperations();
	if (opInfo.length > 0) { 
	    for (int i = 0; i < opInfo.length; i++) {
		echo(" ** NAME: \t" + opInfo[i].getName());
		echo("    DESCR: \t" + opInfo[i].getDescription());
		echo("    PARAM: \t" + opInfo[i].getSignature().length +
		     " parameter(s)");
	    }
	} else echo(" ** No operations ** ");
	echo("\nNOTIFICATIONS");
	MBeanNotificationInfo[] notifInfo = info.getNotifications();
	if (notifInfo.length > 0) {
	    for (int i = 0; i < notifInfo.length; i++) {
		echo(" ** NAME: \t" + notifInfo[i].getName());
		echo("    DESCR: \t" + notifInfo[i].getDescription());
		String notifTypes[] = notifInfo[i].getNotifTypes();
		for (int j = 0; j < notifTypes.length; j++) {
		    echo("    TYPE: \t" + notifTypes[j]);
		}
	    }
	} else echo(" ** No notifications **");
    }

    private static void manageSimpleMBean(MBeanServer mbs,
					  ObjectName mbeanObjectName,
					  String mbeanClassName) {

	echo("\n>>> Manage the " + mbeanClassName +
	     " MBean using its attributes ");
	echo("    and operations exposed for management");

	try {
	    // Get attribute values
	    printSimpleAttributes(mbs, mbeanObjectName);

	    // Change State attribute
	    echo("\n    Setting State attribute to value \"new state\"...");
	    Attribute stateAttribute = new Attribute("State","new state");
	    mbs.setAttribute(mbeanObjectName, stateAttribute);

	    // Get attribute values
	    printSimpleAttributes(mbs, mbeanObjectName);

	    // Invoking reset operation
	    echo("\n    Invoking reset operation...");
	    mbs.invoke(mbeanObjectName, "reset", null, null);

	    // Get attribute values
	    printSimpleAttributes(mbs, mbeanObjectName);
	} catch (Exception e) {
	    e.printStackTrace();
	}
    }

    private static void printSimpleAttributes(MBeanServer mbs,
					      ObjectName mbeanObjectName) {
	try {
	    echo("\n    Getting attribute values:");
	    String State = (String) mbs.getAttribute(mbeanObjectName, "State");
	    Integer NbChanges =
		(Integer) mbs.getAttribute(mbeanObjectName,"NbChanges");
	    echo("\tState     = \"" + State + "\"");
	    echo("\tNbChanges = " + NbChanges);
	} catch (Exception e) {
	    echo("\t!!! Could not read attributes !!!");
	    e.printStackTrace();
	}
    }

    private static void echo(String msg) {
	System.out.println(msg);
    }

    private static void sleep(int millis) {
	try {
	    Thread.sleep(millis);
	} catch (InterruptedException e) {
	    e.printStackTrace();
	}
    }

    private static void waitForEnterPressed() {
	try {
	    echo("\nPress <Enter> to continue...");
	    System.in.read();
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }
}
